Drilling apparatus



Jan. 1, 1929. I

- H. MECOM DRILLING APPARATUS INVENTOR. flmw 1 m Filed July 22, 1926ATTORNEYJ,

Patented 1, 1929.

umran sr nrnsf P ATEN-r OFFICE.

Y -miavnY mncoimor LIBERTY, TEXAS.

DRILLING APPARATUS.

Application filed J'uJy 22,

This invention relates to new and useful im rovements in a drillingapparatus;

8m; object of the invention is to provide an apparatus of the, characterdescribed comprising arotatable stem, a drilling tool associatedtherewith, and a hammer associated .with the stem and operable-therebyand adapted to strike said tool with successive blows, as said stem isrotated to effect l taken on the line 4-4 of Figur the abrasion ordisintegration by said tool of the formation at .the bottom of the bore.

Another object ofthe invention'is to provide an apparatus of thecharacter described in which the drilling tool is independentlyrotatable with respect to the stem but which may be clutched, orinterlocked therewith so as to'rotate, as a unit with-said stem.

With the above and other objects in view this invention has particularrelation to cere 4 is a transverse sectional view e 1. Figure 5 shows abottom view of the bit, and Figure 6 shows a fragmentary vertical.sectional view of the apparatus.

Referring now more particularly to the drawings, wherein, like numeralsof refer-.

'ence designate similar parts in each of the figures the numeral 1designates a tubular drill stem which is adapted t9 be rotated by theusual rotary drilling machine. Attached to the lower end of this drillstem there is a tubular drill collar 2. There is a drilling toolembodyingthe bit' 3, and the separable shank 4 which extends up into thedrill collar 2. The collar 2 has an inside shoulder 5' and the shank ofthe drilling tool has a corresponding external shoulder.6. In assemblmg,the shank of the drilling tool is inserted down through the drill collar2 and the bit of the drillin tool is then attached tosaid shank and therill collar then attached .to the stem 1. The shoulders 5 and 6 willrevent the detachment of the drilling tool from the drill collar. Theshoulders 5 and 6 are formed with clutch jaws 5, 6 adapted a specialcouplin 1926. Serial no. 124,142.

.to engage to lockthe drilling tool to rotate with the drill stem, andto be disengaged, to release said drilling tool so that the stem mayrotatefindependent of it;

I g 7. having a polygonal openlng 8' therethrough and within the drillstem there is a vertically reciprocable hammer 9, havin'g'a polygonalsection 10 which Incorporated into the drillstem 1 there is conforms inshape to and works through the opening 8, and forms an operativeconnec-'tion between the hammer and stem whereb the former is rotated by thelatter.

Means .have been provided for alternately lifting which may be employedwill now be described The-lower end {0f the hammer 9 abuts the upper endof .the shank 4 and these respec-' tive abutting ends have theoppositely di s posed correspondingly'inclined faces 11,-11

and sitely arranged, vertically disposed abrupt shoulders 13, 13 and14', 14 respectively, the

' shoulders 13 facing in a ,direction the opposite of thatofthe-shoulders 14.

ing on 17119 bit 3 the clutch jaws of the shoulders 5 and 6 will-bedisengaged and as the stem 1 is rotated the hammer 9 will rotate withit' and the faces 11 will ride up on the faces 12 elevating the hammer'9, until the shoulders 13 pass" the shoulders .14 and the hammer 9 willthen drop thus striking the upper endof the shank 12, 12, whichterminate in the oppo! 4 in rapid suc- In operation with the drillcollar2 restcession and driving the bit 3 against-the for-,

mation at the bottom of the ore and disintegrating the same. The slopingfaces 11 striking the sloping faces 12 will impart a partialrotation-tothe drilling tool, so that as drilling proceeds the bit at the bottom ofthe bore.

If a be desired to rotate the drilling tool the stem may be slightly 1with the stem, elevated until said clutch jaws 5, 6' engage and thedesired result thus While the bit is thus rotated the. weight of thedrilling tool and hammer 9 will rest on the bottom of the bore and thisweight will be suflicient to cause the bit the formation at the bottofnof the bore. The hammer and drilling toolhave'water accomplished.-

p 3 will slowly turn and thus abrade away said formation,

to disintegrate be supplied to flush away the bit cuttings" J the hammerand permitting the same to drop and strike the vdrilling tool. One formof such means,

courses '15 and 16 through which water mayternal s and the latter ofwhich separatesso as to discharge water on each side of thecenter of thebore being formed. a What I claim is:

A drilling apparatus including a stem, a tubular drill collar attachedto the lower end ofthe stem, a drilling tool embodying a bit and aseparable shank which extends up into the drill collar, said collarhaving an inside shoulder and said shank having an opposin externalshoulder above said ininto the stem havin a polygonal bearingtherethrough, a vertical reciprocable ham-' mer within the stem having apolygonal section which works through said bearing and forms anoperative connection between the hammer and stem, the lower end of thehammer and the upper end of the shank being provided with oppositecorrespondingly inclined faces which terminate in oppositely arrangedvertically disposed, abrupt shoulders, the shoulders of the hammerfacing in a direction the o posite of that of the shoalders of the sha 1oulder, a coupling incorporating In testimony whereof I- have signed myname to this specification.

HARVEY MECOM.

